' Level Gauge, Barrel, Drum Capacity 55 Gallon, Tank Depth 33.5 In, Connection Size 3/4 In NPT, Calibration Unit Material Inner and Outer Plastic, Calibration Unit Increments Full, 7/8, 3/4, 5/8, 1/2, 3/8, 1/4, 1/8 Empty plus Gallons and Liters., Gasket Material Duro Nitrile, Bushing Material Aluminum, Assembly Nut Material HDPE Plastic, Rod Material Galvanized Steel, Rivet Material Brass, Float Material HDPE Plastic '